Controllable method for preparing orthogonal-phase stannous sulfide two-dimensional monocrystalline nanosheet

Abstract

The invention discloses a controllable method for preparing an orthogonal-phase stannous sulfide (SnS) two-dimensional monocrystalline nanosheet. The method includes the steps that a substrate is arranged on the downstream of a heating center of a horizontal tubular furnace and is 8-20 cm away from the heating center, SnS powder is placed in a high-temperature-resistant container, and the container is placed in the heating center of the horizontal tubular furnace; the tubular furnace is vaccumized, when the pressure intensity in the furnace is reduced to 0.1 Pa, inactive gas is injected into the furnace so that the pressure intensity in the tubular furnace can be 20-300 Torr again, and the flow speed of the gas is kept between 20 sccm to 200 sccm; the temperature of the heating center of the horizontal tubular furnace is raised to 600-800 DEG C, reaction time is 5-30 min, the substrate is taken out after the temperature in a cavity of the tubular furnace is naturally lowered to room temperature, and the stannous sulfide two-dimensional monocrystalline nanosheet grows on the surface of the substrate. The method is easy to operate, low in cost and high in controllability. Obtained SnS has the advantages of being large in size, good in uniformity and high in crystallinity, and the method has important research value and wide application prospects in the fields of field effect transistors, photoelectric detectors, photocatalytic hydrogen generation, lithium ion batteries and the like.

Description

technical field [0001] The invention relates to the field of two-dimensional semiconductor technology. More specifically, it relates to a method for the controllable preparation of orthorhombic stannous sulfide (SnS) two-dimensional single-crystal nanosheets. Background technique [0002] Van der Waals crystal is a new type of material emerging in recent years. Its remarkable feature is that the molecular layers are bound by strong covalent bonds, while the molecular layers are linked by weaker Van der Waals forces. together. This feature makes it easy for such materials to form ultra-thin two-dimensional structures, and their thickness can even reach the thickness of a single molecular layer or several molecular layers. The ultra-thin two-dimensional structure and atomic-level smooth plane make it more conducive to electrostatic regulation than bulk materials, which is conducive to the development of electronic devices with shorter channels and smaller gates, and ultimate...

AI Technical Summary

Problems solved by technology

For example, the exfoliation method, although high-quality SnS single crystal nanosheets can be obtained, but the repeatability of this method is poor, the area of ​​the prepared nanosheets is relatively small, the number is small, and it is not suitable for large-scale electronic device integration; the chemically synthesized SnS morphology Inhomogeneous and poor crystallinity, more surface defects, will reduce carrier mobility

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